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mpa-first-guidelines: Instructions file for GitHub Copilot

.github/copilot-instructions.md

mpa-first-guidelines copilot-instructions.md is an instructions file for GitHub Copilot from RealistSec/mpa-first-guidelines. It costs 1,197 tokens per session, scanned A, original, MIT.

A set of instructions for building multi-page applications, where separate page loads handle distinct parts of a site, instead of defaulting to a single-page app.

In plain words
What is it for?
Use it when configuring Copilot, Cursor, Claude, Codex, or another coding agent to create strict or more flexible multi-page applications.
Why use it?
It gives coding agents consistent rules for following the repository’s preferred PHP and JavaScript architecture.

Instructions file for GitHub Copilot

Written for GitHub Copilot: a Copilot instructions file. Also seen: mentions Codex.

This is RealistSec/mpa-first-guidelines's own configuration. It tells GitHub Copilot how to work on mpa-first-guidelines itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything mpa-first-guidelines configures →

not rated 11repo 11mo ago A scan 1,197 tokens original MIT
View source ↗ RealistSec/mpa-first-guidelines
Reuse

Borrowing it

Nothing to install: this file belongs to RealistSec/mpa-first-guidelines. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/RealistSec/mpa-first-guidelines/main/.github/copilot-instructions.md
Clone the repo
git clone --depth 1 https://github.com/RealistSec/mpa-first-guidelines

Made for: GitHub Copilot.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

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README.md
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Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

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<a href="https://agentmods.dev/instructions/realistsec/mpa-first-guidelines/copilot-instructions"><img src="https://agentmods.dev/badge/instructions/realistsec/mpa-first-guidelines/copilot-instructions.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 1,197 This file is loaded in full into every session.
When invoked 1,197 The same file — it is already loaded in full.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.01197 $0.01197
Opus 5.5 $0.00479 $0.00479
Sonnet 5.5 $0.00239 $0.00239
Haiku 4.5 $0.00120 $0.00120

Measured 2mo ago against content hash 734bf27da400, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

mpa-first-guidelines copilot-instructions.md scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2mo ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

.github/copilot-instructions.md · 96 lines

How it starts

The opening of the file, as written. The whole thing — 96 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Copilot Instructions: MPA-First Guidelines Repository

Repository Purpose

This is a reference documentation repository containing MPA (Multi-Page Application) development guidelines for AI coding agents. Users copy these guidelines into their own projects to teach AI tools (GitHub Copilot, Cursor, Claude, Codex, etc.) to generate MPA-first code instead of defaulting to SPA frameworks.

Key Files & Their Roles

Base rule files:

  • mpa-rules.md - Comprehensive, strict MPA-first mandate with strict PHP & vanilla JS only. This is the primary reference document.

  • mpa-relaxed-rules.md - Variant ruleset allowing full use of PHP & jQuery for progressive enhancement while maintaining MPA architecture.

Assistant-specific base instruction files:

  • .github/agents/mpa-strict-agent.md - Copilot agent-specific instructions file based on mpa-rules.md for strict MPA adherence.

  • .github/agents/mpa-relaxed-agent.md - Copilot agent-specific instructions file based on mpa-relaxed-rules.md for a more lenient MPA approach.

Documentation:

  • README.md - User-facing documentation explaining the problem, solution, and how to integrate these rules into AI coding workflows.

Writing Style & Tone

When editing these guidelines:

  • Be authoritative and prescriptive - Use "MUST" and "DO NOT" language. These are rules, not suggestions.
  • Provide concrete examples - Every principle should have a code snippet showing the correct pattern.
  • Explain the "why" - Help developers understand the philosophy, not just the mechanics.
  • Stay opinionated - The entire premise is rejecting the SPA-default paradigm. Don't hedge or equivocate.

Content Maintenance Patterns

Adding New Rules or Sections

  1. Keep examples realistic - Use patterns that would appear in actual projects
  2. Maintain parallelism - Both mpa-rules.* with .github/agents/mpa-strict-agent.md and mpa-relaxed-rules.* with .github/agents/mpa-relaxed-agent.md should cover the same topics in the same order
  3. Update the table of contents - If you add major sections, ensure navigation is clear

Read the full file on GitHub · 96 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 2mo ago First seen · 96 lines · 1,197 tokens per session scan A 734bf27da400

Subscribe to this mod's changes

mpa-first-guidelines copilot-instructions.md is an instructions file published in the GitHub repository RealistSec/mpa-first-guidelines (11 stars, last pushed 11mo ago), licensed MIT. It adds 1,197 tokens to every session, about $0.0048 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

Frontendai-coding-assistantcopilot-instructionscursor-rulesmpa-firstseovanilla-javascript
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